"The Messenger of Allah ﷺ offered expiation of a Sa' of dates, and he enjoined the people to do likewise. Whoever does not have that (must give) half a Sa' of wheat."  

كَفَّرَ رَسُولُ اللَّهِ ﷺ بِصَاعٍ مِنْ تَمْرٍ وَأَمَرَ النَّاسَ بِذَلِكَ فَمَنْ لَمْ يَجِدْ فَنِصْفُ صَاعٍ مِنْ بُرٍّ